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Home Computer Tutorials Computer Knowledge How to Fix Windows Defender Error Code 0x80073b01?

How to Fix Windows Defender Error Code 0x80073b01?

Mar 28, 2025 am 10:48 AM

Five ways to solve Windows Defender error code 0x80073b01

Some Windows users reported encountering Windows Defender error code 0x80073b01. If you also encounter this problem, this article will provide some practical and effective solutions.

When using or opening Windows Defender, the error code 0x80073b01 may appear. This may be caused by Windows Defender conflicts with other security programs, or system files are corrupted.

Here are a few ways to solve this problem:

Method 1: Uninstall third-party antivirus software

Completely uninstalling third-party antivirus software can fix Windows Defender error code 0x80073b01. If you have installed software such as Webroot, Bitdefender, or AVG, please refer to the following link to uninstall:

Method 2: Run SFC and DISM

System file corruption may also cause the "Windows Defender error code 0x80073b01" problem. You can try to fix it using SFC and DISM utilities.

  1. Enter cmd in the search box and select Run as administrator.
  2. Enter sfc /scannow and press Enter to run the SFC scan.
  3. Restart the computer and run the command prompt as administrator again.
  4. Enter the following commands and press Enter after each command:
    • DISM /Online /Cleanup-Image /CheckHealth
    • DISM /Online /Cleanup-Image /ScanHealth
    • DISM /Online /Cleanup-Image /RestoreHealth

Method 3: Check the Windows Defender service status

Checking the Windows Defender service status can help fix error 0x80073b01. The operation steps are as follows:

  1. Enter services in the search box to open the service window.
  2. Check if the following services are running:
    • Windows Defender Firewall – Automatic | Started
    • Windows Defender Advanced Threat Protection – Manual
    • Microsoft Defender Anti-Virus Network Check Service – Manual
    • Microsoft Defender Anti-Virus Service – Manual

How to Fix Windows Defender Error Code 0x80073b01?

Method 4: Modify the registry key

Modifying the registry key can also fix Windows Defender error code 0x80073b01. However, there may be risks in modifying the system registry key. It is recommended that you back up the registry key in advance or create a system restore point.

  1. Press Windows R to open the run box. Enter regedit and press Enter to open the Registry Editor.
  2. Remove msseces.exe from the following path:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\Image File Execution Options

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\DisallowRun

How to Fix Windows Defender Error Code 0x80073b01?

Method 5: Update the operating system

It is recommended to update your Windows to the latest version to fix Windows Defender error code 0x80073b01.

  1. Press the Windows I key to open the settings.
  2. Go to Updates and Security > Windows Update and click Check for updates. If there are any new updates, you can download and install them.

Summarize

If you encounter the problem of "Windows Defender error code 0x80073b01", please try the above method and try one by one until the problem is solved.

How to Fix Windows Defender Error Code 0x80073b01?

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